example4.py

def print_unordered_pairs(array_a, array_b):
    for a in array_a:
        for b in array_b:
            if a < b:
                print('%d, %d' %(a, b))

print_unordered_pairs([1, 2, 3, 4, 5], [3, 1, 2, 5, 4])

# The complexity of the print_unordered_pairs function is: O(N^2)
# We do a nested loop = length(array_a) * length(array_b) = N^2
# There are O(N^2) pairs
# Conclusion: O(N^2)